Re: aluminum radiators
I bought the 'nascar'-type, universal, picked a size to fit the stock jeep opening. It is probably the same as what you are describing out of the Summit catalog. (If you want, I can get the size and part number I used.) Griffin directed me away from 'factory-direct', to get (what was then) a better price. After checking with some of the catalog sources that Griffin referred me to, I bought from Jegs. It was about 175, a few years ago. I got the 'cheaper', lighter-duty version, 2-tube, with the smaller (1-inch) tubes. They also had 1.25-inch tubes. I could have spent a lot more, for one that was made to fit. As it is, I had to make my own brackets. I designed/built brackets that are of the GM-clamp-in-type, and they attach to the stock radiator mounting holes in the stock jeep grille. I put enough flex in the brackets that there is no way that off-road-jeep-flex can be transmitted to the radiator. I do not have any fasteners that actually go through any of the Griffin radiator hardware (it's strictly a 'clamp' (top-to-bottom) arrangement). The radiator is cross-flow, listed for Chevy applications, with correct hose outlet/inlet for my engine.
I can not see any epoxy in the construction. I can not see the method used to seal the tubes to the headers. The headers and tanks, and filler-neck, are all beautifully heli-arced together, to the quality seen on nascar cars and street-rods.